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Based on your profile, you have a 2000. So no pre-wire for underwater lights.

No on powered off the required NAV lighting. You will want to have the ability to run transom LEDs separate from the NAV lights
I would avoid any unnecessary small ring terminals on the main battery switch. Wire them to the helm BUS. You can use the supplied remote as your on/off.
This may be the best option, having a dedicated on/off rocker. Some wireless controllers are programmed to come on when B+ is restored. So you may find the lights come on every time you turn the main switch on.

2nd using the helm bus if you can. That way you don’t have to have two sets of wire runs as well, just power and ground to the switch then power and ground from the switch to the lights. Definitely put them on a dedicated switch.

Basically what he was saying is to use the wiring at the helm that is already existing. If you have a spare accessory switch on the dash, simply run a power wire from it to the transom light then run the ground from the transom light to the nearest ground bus bar (usually one on the port rear corner). Check/change your fuse size on this switch to match your needs with the new lights.

If you do not have an open switch, mount an additional switch for the light. Pull power from the fuse panel (with the correct fuse size of course) to the switch. Run power wire from switch to the transom light. Then ground to nearest ground bus bar. You can add a ground wire to the switch and the blue wire from the gauges/switches to make the switch light up when nav/anchor switch is turned on.

Basically what he was saying is to use the wiring at the helm that is already existing. If you have a spare accessory switch on the dash, simply run a power wire from it to the transom light then run the ground from the transom light to the nearest ground bus bar (usually one on the port rear corner). Check/change your fuse size on this switch to match your needs with the new lights.

If you do not have an open switch, mount an additional switch for the light. Pull power from the fuse panel (with the correct fuse size of course) to the switch. Run power wire from switch to the transom light. Then ground to nearest ground bus bar. You can add a ground wire to the switch and the blue wire from the gauges/switches to make the switch light up when nav/anchor switch is turned on.

Any idea where to find a wiring diagram? I see four wires coming off of the switch. They are connected to a single plug. Two swtiches, two plugs both 4 wires in to 1.

If you find any kind of diagram I would be amazed. Sounds like you have one or two ACC switches your lights could be wire to. Please try and post some pics of the back of the switch you intend to use and that will help. Blue wire to switch is for the light in the switch usually. Black is ground for bulb in the switch. Then there is usually a red or orange wire that is the fused 12v supply. If there is a fourth wire I would venture that is switched 12v. Again pictures would help.
I would get out your multimeter and pull the spade connector back off the switch and figure out which is constant 12 v to switch and which post is switched 12v. Once you know that you just do what KoolAid said. Run that switched 12v to your transom light and give them a ground at the bus bar.

Your brackets are going to block a bunch of light mounting them that far out. I’d move them towards the inside another 6-8”. Height wise you’re good. You want them more or less just below the water line.